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Finding the Fourth Proportional to 520.58, 780.63 and 191.30

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Solution

The fourth proportional to 520.58, 780.63 and 191.30 is: 286.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.58 : 780.63 = 191.30 : x
  2. Step 2: Convert to fraction form
    520.58/780.63 = 191.30/x
  3. Step 3: Cross multiply
    520.58x = 780.63 × 191.30
  4. Step 4: Simplify right side
    520.58x = 149,330.62
  5. Step 5: Solve for x
    x = 149,330.62/520.58
  6. Step 6: Final answer
    x = 286.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.